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Adding a Parameter Query to Look Up Information
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The classic way to make results dynamic at runtime is with a parameter query. A parameter query is a regular SELECT statement with a WHERE clause that has one or more key-value pairs. The key is a column name in the data source specified by the FROM clause for the SELECT statement. The value is a parameter or a criterion. The WHERE clause contains an operator, such as an equal sign (=), between each key-value pair that returns a value of True or False. If your parameter query has more than one key-value pair, then you must have operators between pairs so that the overall parameter query returns a value of True or False. The parameter query returns a subset of rows from the original query for parameter expression values equal to True. In a sense, a parameter query looks up information for rows that match its search criteria. Parameter queries are so popular that Microsoft has traditionally made them very easy to use in its database applications, and the tradition continues with TableAdapters for a DataGridView control. Recall that a DataGridView control relies on a TableAdapter. The Windows Form Designer automatically adds the TableAdapter for the DataGridView control to a Components tray below the form containing the DataGridView control. You can add a new query to the TableAdapter from the smart tag window for the TableAdapter. This query should contain a WHERE clause for a parameter query. After completing the query, the Windows Form Designer adds a control to the form that allows users to specify parameter values and run the parameter query to specify a subset of values from the original query to populate the DataGridView control. You can start to create your first parameter query graphically by dragging the ProductSubCategory node from the CatSubCatAdventureWorks_DataDataSet data source in the Data Sources window for the WinCh13 project. This adds a DataGridView control and a corresponding BindingNavigator control to a new form, such as Form8. Edit the columns for the DataGridView control to drop the rowguid and ModifiedDate columns. The Load event procedure for Form8 includes the following assignment statement for dynamically resizing the ProductSubcategoryID column in the DataGridView control so that the column is initially wide enough to display its heading without cropping. Me.ProductSubcategoryDataGridView. _ Columns("ProductSubcategoryID").MinimumWidth = 115
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CHAPTER 13 USING VISUAL DATABASE AND FORM DESIGN TOOLS
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In the Components tray, open the smart tag for the ProductSubcategoryTableAdapter and click the Add Query link. After the click, the Search Criteria Builder dialog box opens. You must specify the syntax for a new query, and you must assign the new query a name (or you can use a previously specified query). The query name specifies a FillBy method that you can invoke with code for more customized solutions. However, the basic approach described here requires no code. In the current example, assign the name FillByCatID as the name of the query. The syntax for the query within the Search Criteria Builder dialog box appears in Figure 13-21. Figure 13-22 shows Form8 after it initially opens and after a value of 1 is entered as an @CatID parameter. The top view of Form8 shows the form when it opens. Notice that the BindingNavigator permits navigation to any one of 37 rows in the DataGridView control. This view of the data returned by the ProductSubcategoryTableAdapter includes no parameters. However, you can see the control for entering a parameter value above the BindingNavigator control. A TextBox is available for specifying an @CatID parameter value, and the text to the right of the TextBox can be clicked to invoke a parameter query that populates the DataGridView control with the results of the query. After entering a value of 1 for the parameter and clicking FillByCatID1, the DataGridView control displays just three rows. Each of these rows has a ProductCategoryID column value of 1. You can change the contents of the DataGridView control to display any other subset of rows based on ProductCategoryID column values by inputting a new value for @CatID and clicking FillByCatID1.
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Figure 13-21. You can create a parameter query for a DataGridView control as simply as naming the query and adding a WHERE clause in a dialog box.
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